Cylinder head gasket

Abstract

A cylinder head gasket is provided for dealing with gas leak between cylinder bores of an engine with a reduced size and rigidity. A cylinder head gasket is formed of one or more metal plates. One metal plate is provided with a first bead, a second bead, and a third bead arranged from inside in this order around a cylinder bore. The first bead is formed around each of the cylinder bores. The second beads are combined into a single bead having a width greater than a width of other section of the second beads in an area between adjacent cylinder bores. The third bead does not pass through the area between the adjacent cylinder bores and surrounds all of the cylinder bores.

What is claimed is: 
     
       1. A cylinder head gasket comprising:
 at least one metal plate having a plurality of cylinder bores and at least one area between two adjacent cylinder bores, 
 first beads formed in the metal plate to surround the respective cylinder bores, independently, 
 second beads formed in the metal plate to completely surround the respective cylinder bores outside the first bead, said second beads being combined into a single section in the at least one area between the two adjacent cylinder bores, said single section having a width greater than that of a section other than the single section of the second bead, and 
 a third bead formed in the metal plate around all of the cylinder bores outside the second bead, said third bead extending outside the area between the adjacent cylinder bores, 
 wherein said third bead has a width greater than those of the first bead and the second bead. 
 
     
     
       2. A cylinder head gasket according to  claim 1 , wherein said third bead surrounds only the cylinder bores without surrounding bolt, water and oil holes. 
     
     
       3. A cylinder head gasket according to  claim 2 , wherein said first, second and third beads are full beads.